HIGH-ACCURACY DETERMINATION OF THE SHAPE OF THE EFFICIENCY CURVE OF THE HPGE DETECTOR IN THE ENERGY-RANGE 900-KEV TO 1300-KEV

被引：14

作者：

HAWARI, AI

FLEMING, RF

机构：

[1] The University of Michigan, Department of Nuclear Engineering, Ann Arbor

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1994年 / 353卷 / 1-3期

关键词：

D O I：

10.1016/0168-9002(94)91613-6

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A method for high accuracy characterization of the shape of a High Purity Germanium (HPGe) detector efficiency curve has been developed. Radionuclides with decay schemes having at least two gamma lines, for which the yield ratio can be calculated accurately, are used to establish the shape of the detector efficiency curve. Measurements using Co-60 and Sc-46 sources show that the behavior of the efficiency curve of the detector on a log-log scale is indistinguishable from that of a straight Line with a slope of -0.828 +/- 0.004. Measurements using a Na-24 source show that above 1368 keV this behavior no longer holds due to pair production and escape effects. The measured value of the slope in that case is -0.951 +/- 0.002. The proposed method is to be used in measurements requiring the minimum calibration bias in the determination of the reaction rate ratios, such as reactor dosimetry applications, integral cross section measurements and k(0) determination for neutron activation analysis.

引用

页码：106 / 108

页数：3